The innovative charging system consist is perfect for road warriors or commuters. To charge the Discovery 640, you insert the headset into the unique, pen-size carrying case and attach the bundled compact wall charger to the bottom. Unlike other headsets, you are not restricted use just the Plantronics charger - you can also attach a Nokia, Motorola, Sony Ericsson, or Siemens wall or car charger. In addition, you can attach a module that contains a single AAA battery (see picture to the right). This let's you easily charge the battery when away - a single battery will charge the headset full two times.

The Discovery 640 offers up to 15 hours of talk time (and 70 hrs of standby time) when used with the AAA battery to charge the headset between calls. Without AAA battery, the headset offers up to 5 hours of talk time between charges.

I can't get this thing to sit properly in the charger. After docking it, it slowly rises out of the charger and disconnects. I'm wanting it to rest vertically so that gravity might help keep it connected but it doesn't come with a stand, or have a flat bottom. I wish it just snapped in place and I wouldn't have to worry about whether or not it's charging. I refuse to use rubberband to keep this thing in place. by
Anonymous

Doesn't have noise canceling

Living in NY, noise canceling is a must unless you stay indoors. Lightweight, comfortable, loved the battery charger for on-th-go charging. Very disappointed that sound quality was not sufficient for outside use.by
Anonymous

Want to lose $$? Buy this headset

While technically superb, this headset is so lightweight you don't know when it's gone AWOL, with or without the earpiece anchor (and it doesn't stay in well to begin with). So use superglue or take your chancesby
Anonymous

Want to lose $$? Buy this headset

While the Plantronics is technically superb, it is so lightweight weight that you don't know when it's gone AWOL. Lost two in one weeek, to the tune of $240. Super glue it to your ear, or take your chances. by
Anonymous

Bad Model?

It's a great unit in a few respects...you can hear people very clearly, it's very comfortable and light, and the charger is a great idea. But it all ends there.
The ear gels fall off way too easaily! Lost one on the first day! The unit does not sit in the charger well (As most have stated). But worst of all, the person on the other end of your call has a terrible time hearing me over the noise that it was picking up (in a very quiet setting). I'm not sure if I had a bad unit, but I didn't want to try my luck on this model again.by
Anonymous

Won't stay in charger :(

Love the headset with the Treo 650. Loud enough, lightweight, and comfortable on and in the ear. However, the darn thing will not stay seeded in the charger without scotch tape or a rubber band. I returned the first and tried a second, but they both had the same problem.by
Anonymous

Love IT

It is light and stays in place. It has wonderful sound quality. I love it!!!by
Anonymous

Most-convenient!

I've spent close to $80+/ month on headsets when I was over-the-road and I'm glad to say that this is the last headset I'll ever need! It's lightweight, sleek (as opposed to Plantronics' earlier models), easy to pair and use, and it fits into my purse so well. I don't know what the mirror on the backside of the case is needed for but I like that, too. In my semi, hearing the person on the other end was literally painful, with having to press the earpiece to my ear and all (I would've been better off w/o a headset then), but with that gel insert I can hear them as clearly as if they were standing next to me. Overall, I don't know how I've been driving all 48 and Canada without it! I'm a fan for life. (-:by
Anonymous

I hated this thing

This headset does not stay in your ear well, did not have a great battery life, and most annoyingly - would not stay in its charger - I had to Macgyver it with a rubberband to get it to charge without popping out of the charger. by
Anonymous

Don't Buy!

I don't know if it works... I can't read the small print on the instructions!!!!by
Anonymous

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